This formula was developed for professionals to help plants set abundant buds that matured into beautiful flowers. This formula also contains a higher level of magnesium to keep leaves green. Jack Peters original formulas. Availability: Usually ships the next business day. Jack's Classic Blossom Booster Fertilizer (1.5 lb) 9651024$9.95 We guarantee satisfaction with everything we sell. Questions? Call us toll free at 877-898-6546. Mon. - Sat. 9-6, & Sun. 10-5 Mountain Time